I am sure others will have more elegant approaches, but i noticed a few things ...
The first issue is an easy formatting issue - For the matrix visual got to Row Headers and turnoff stepped layout. this will give you the format you desire.

Secondly, your measures look correct, but the issue is being driven by the 2 tables (fact tables) attached to the single dimension table and the measure being calculated across both. Essentially you have no relationship established on the dates in the 2 tables, thus the calculations are wrong. Try consolidating the activity and cost tables into a single fact table.
Attached example
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Bob Parsons
Business Intelligence Manager
Star Produce
Calgary, AB
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Original Message:
Sent: Jan 12, 2022 02:15 PM
From: Vinu Hari
Subject: Reports
Dear experts, Need the help to get the desired report result as per attached - pls help
File attached
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FA
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